/////////////////////////////////////////////////////////////////////////////
//
// Project ProjectForge Community Edition
//         www.projectforge.org
//
// Copyright (C) 2001-2014 Kai Reinhard (k.reinhard@micromata.de)
//
// ProjectForge is dual-licensed.
//
// This community edition is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as published
// by the Free Software Foundation; version 3 of the License.
//
// This community edition is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
// Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, see http://www.gnu.org/licenses/.
//
/////////////////////////////////////////////////////////////////////////////

package org.projectforge.plugins.core;

import java.util.ArrayList;
import java.util.List;

/**
 * @author Kai Reinhard (k.reinhard@micromata.de)
 */
public class PluginsRegistry
{
  private static final org.apache.log4j.Logger log = org.apache.log4j.Logger.getLogger(PluginsRegistry.class);

  private static PluginsRegistry instance;

  private final List<AbstractPlugin> plugins = new ArrayList<AbstractPlugin>();

  public synchronized static PluginsRegistry instance()
  {
    if (instance == null) {
      instance = new PluginsRegistry();
    }
    return instance;
  }

  public PluginsRegistry()
  {
  }

  public void register(final AbstractPlugin plugin)
  {
    for (final AbstractPlugin pl : plugins) {
      if (pl.getClass().equals(plugin.getClass()) == true) {
        log.warn("Can't add plugin twice. Plugin '" + plugin.getClass() + "' already added.");
        return;
      }
    }
    plugins.add(plugin);
  }

  public List<AbstractPlugin> getPlugins()
  {
    return plugins;
  }

}
